Arrange the following group of terms in order of decreasing extension.

1.Mammal

2.Wildcat

3.Feline

4.Animal

5.Vertebrate

A3, 2, 5, 1, 4

B2, 3, 1, 5, 4

C4, 1, 5, 2, 3

D4, 5, 1, 3, 2 ✓ Correct

Correct answer: (D) 4, 5, 1, 3, 2

Explanation

From widest to narrowest the classes run Animal, Vertebrate, Mammal, Feline, Wildcat.

Extension counts the objects a term applies to, so the most inclusive term leads.

Animal includes vertebrates, which include mammals, which include felines, which include wildcats.

Each successive term denotes a proper subset of the one before it.

This shrinking denotation yields the order 4, 5, 1, 3, 2.

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